Analog Devices ADSP-2106x SHARC User Manual page 348

9 Link Ports
r0=dm(LBUF2); /* read DMA size
dm(C4)=r0; /* Set DMA count to length of data buffer */
r0=destination_3;
dm(II4)=r0; /* Set DMA rx index to start of destin buffer
r0=1;
dm(IM4)=r0; /* step size
r0=0x00000300;
dm(LCTL)=r0; /* enable LBUF2 DMA Rx
bit clr irptl LP2I;
bit set imask LP2I;
bit set mode1 IRPTEN;
rti;
second_master_mode:
token_read2:
r1=0xC0; /* check if slave read the tokens
r0=dm(LCOM); /* check if slave emptied fifos
r0=r0 AND r1; /* to be sure they are in sync for the
if NE jump token_read2; /* the second DMA transfer
r0=0x3fe3f;
dm(LAR)=r0; /* LAR Register:
r0=0x00000900;
dm(LCTL)=r0; /* LBUF2: Tx, non DMA
r0=@source_2;
dm(LBUF2)=r0; /* Tx size of DMA to the slave
r0=source_2;
dm(II4)=r0; /* Set DMA tx index to start of source buffer.
r0=1;
Listing 9.3 Link Token Passing Example (continues)
9 – 38
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*/
*/
/* clear pending Link buffer 2 interrupt
/* Enable Link buffer 2 interrupt
/* Global interrupt enable
LBUF2->port0
*/
*/
*/
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